RADON, THORON AND THEIR PROGENY DISTRIBUTION AND ESTIMATION OF ANNUAL EFFECTIVE DOSE AND EXCESS LIFETIME CANCER RISK IN PANATHADY, KASARAGOD DISTRICT, KERALA

Abstract Radon and thoron are natural radioactive gases that tend to accumulate in the indoor environment and one of their major health implications is the ability to cause lung cancer. Present study comprises the quantification of radon and thoron activity concentrations and measurement of gamma exposure rates in different types of dwellings from the endosulfan-affected area, Panathady, Kasaragod district, Kerala. It is observed that, residents of this area were more prone to various diseases and health problems including cancer. The LR-115 type II solid state nuclear track detectors with single entry pin-hole based dosemeters have been used for the measurement of 222Radon and 220Rn activity concentrations. The assessment of radiological parameters such as annual effective doses and excess lifetime cancer risk has also been done in order to understand the dose level and the associated risk. The estimated values have been compared with the limit recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) and International Commission on Radiological Protection (ICRP). The average indoor radon and thoron activity concentrations observed in these dwellings were 134 ± 30 and 111 ± 28 Bq m−3, respectively. The estimated activity concentrations, effective doses, etc. are found to be within the recommended level by the UNSCEAR or ICRP.

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ACTIVITY CONCENTRATIONS OF NATURALLY OCCURRING RADIONUCLIDES IN SOME COMMERCIAL BOTTLED WATERS FROM PARTS OF SOUTHWESTERN NIGERIA

Journal of Natural Sciences Engineering and Technology ◽

10.51406/jnset.v15i1.1768 ◽

2017 ◽

Vol 15 (1) ◽

pp. 82-93

Author(s):

O O ALATISE ◽

Y S AKINSANYA

Keyword(s):

Water Samples ◽

Age Groups ◽

Germanium Detector ◽

Bottled Water ◽

World Health ◽

Radiological Protection ◽

Southwestern Nigeria ◽

Activity Concentrations ◽

Effective Doses ◽

Recommended Level

In this work, the presence of natural radioactivity in bottled waters from parts of south-west Nigeria was investigated. The activity concentrations of 226Ra, 232Th and 40K in the water samples were ob-tained using a high-purity germanium detector. The ranges of activity concentrations obtained for 232Th, 226Ra and 40K were 0.15 to 1.25Bq l-1, 0.02 to 2.94Bq l-1 and 6.96 to 46.47 Bq l-1, respectively. 40K has the highest activity concentration in the bottled water samples while 232Th has the least value. The activity concentrations obtained together with ingested dose conversion factors, were used to calculate the annual effective doses for six age groups ranging from < 1 to >17 years. The calculated total annual effective doses (mSvy-1) ranged from 0.01 to 4.16 and the values are age dependent (highest for < 1year and lowest for 7-12years age groups). The results showed that the average annu-al effective dose for 35% of the bottled water brands were below the World Health Organization (WHO) recommended level of 0.1 mSvy-1 for drinking water. Furthermore, out of the remaining 65% that were higher than the WHO recommended level, 9% were higher than 1 mSvy-1, which is the radia-tion exposure limit for the general public according to the recommendation of the International Com-mission on Radiological Protection. Consequently, consumption of some of the bottled water brands investigated in this study could constitute radiological hazard especially for the < 1 and 12-17years age groups.

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First indoor radon mapping and assessment excess lifetime cancer risk in Iran

MethodsX ◽

10.1016/j.mex.2019.09.028 ◽

2019 ◽

Vol 6 ◽

pp. 2205-2216 ◽

Cited By ~ 1

Author(s):

Samira Sherafat ◽

Sepideh Nemati Mansour ◽

Mohammad Mosaferi ◽

Nayyereh Aminisani ◽

Zabihollah Yousefi ◽

...

Keyword(s):

Cancer Risk ◽

Indoor Radon ◽

Lifetime Cancer Risk ◽

Excess Lifetime Cancer Risk

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Assesment and evaluation of excess lifetime cancer risk for Occupants of university of Uyo permanent campus, Nigeria

International Journal of Physical Research ◽

10.14419/ijpr.v5i1.7564 ◽

2017 ◽

Vol 5 (1) ◽

pp. 28 ◽

Cited By ~ 2

Author(s):

Sunday Etuk ◽

Akaninyene Antia ◽

Okechukwu Agbasi

Keyword(s):

Cancer Risk ◽

Niger Delta ◽

Risk Estimation ◽

Health Hazard ◽

Delta Region ◽

Lifetime Cancer Risk ◽

Excess Lifetime Cancer Risk ◽

Niger Delta Region ◽

Health Hazard Indices ◽

Effective Doses

This paper presents the results of ambient radioactive radiation, radiation health hazard indices and excess lifetime cancer risk estimation within University of Uyo campus, Use Offot, Uyo, Niger Delta region of Nigeria. Mean annual outdoor and indoor equivalent doses of 0.284mSv/yr. and 0.854mSv/yr. respectively were recorded, being less than 1mSv/yr. maximum recommended limit for general public. Mean annual outdoor and indoor effective doses of 0.174mSv/yr. and 0.645mSv/yr. respectively with a total of 0.819mSv/yr. were computed. The mean outdoor and indoor ELCR values of 0.61x10-3 and 2.26 x 10-3 respectively, with a mean total of 2.87 x 10-3 were also computed. The results though higher than the world’s average, are comparable with those of some other locations within the Niger Delta region.

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Mapping of indoor radon survey and dose estimations in health centres in Turkey

Indoor and Built Environment ◽

10.1177/1420326x15606508 ◽

2016 ◽

Vol 26 (3) ◽

pp. 327-336 ◽

Cited By ~ 1

Author(s):

Nevzat Damla ◽

Ayhan Kara ◽

Eyüp Tel ◽

Cafer M. Yesilkanat

Keyword(s):

Cancer Risk ◽

Effective Dose ◽

Annual Effective Dose ◽

Indoor Radon ◽

Future Research ◽

Indoor Radon Concentration ◽

Lifetime Cancer Risk ◽

Excess Lifetime Cancer Risk ◽

Health Centres ◽

Level 3

Radon and its short-lived daughter products, leading to lung cancer, are the most significant contribution to the exposure of man to ionizing radiation from natural sources. Therefore, the present study aimed to assess indoor radon measurements in 39 rooms of 15 health centres in Osmaniye city, Turkey using CR-39 solid-state nuclear track detectors based on radon dosimeters. Indoor radon concentrations were found to change from 8 to 108 Bq·m−3. The associated radiological parameters such as the annual effective dose and excess lifetime cancer risk were computed for staff/patient in the rooms surveyed. The mean annual effective dose and excess lifetime cancer risk values were estimated to be 0.29 mSv and 1.02 × 10−3, respectively. The annual computed effective doses are lower than the suggested action level (3–10 mSv·y−1). Also, with ordinary Kriging method, by using R programing language and quantum geographic information system, indoor radon concentration, annual effective dose, and excess lifetime cancer risk interpolated values were recorded and mapped. The findings obtained in the current study concerning radon levels and their variations will provide baseline values for future research surveys.

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Spatial distributions of natural radionuclide concentrations of bottled mineral water: doses estimation and health risk assessment

Environmental Health Engineering and Management ◽

10.34172/ehem.2020.13 ◽

2020 ◽

Vol 7 (2) ◽

pp. 107-117

Author(s):

Amineh Salehipour ◽

Akbar Eslami ◽

Mohammad Mirzaee ◽

Fatemeh Bolori ◽

Mohammad Hosien Saghi ◽

...

Keyword(s):

Cancer Risk ◽

Effective Dose ◽

Mineral Water ◽

Natural Radionuclides ◽

Age Groups ◽

Natural Radionuclide ◽

Mineral Waters ◽

Lifetime Cancer Risk ◽

Excess Lifetime Cancer Risk ◽

Activity Concentrations

Background: Evaluation of the various types of water reveal that groundwater comprises 99% of the earth’s available fresh water. Many factors affect the type and degree of mineralization, as well as the natural radionuclides content in these types of water. The consumption of bottled natural mineral water, which comes from groundwater, among Iranians is gradually increasing. Therefore, the detection of high concentrations of radionuclides, associated with consumption of groundwater, is proposed as a public health problem in several areas. Methods: In this study, the activity concentration of natural radionuclides such as 226Ra, 228Ra, 210Pb, and 40K, annual effective dose for three age groups (<1 year, 7-12 years, and >17 years), and excess lifetime cancer risk due to the ingestion of natural radionuclides present in 70 different commercial bottled mineral waters from most provinces of Iran, were evaluated. Activity concentrations were measured using gamma spectrometry and a high purity germanium detector (HPGe). Results: The results showed that the activity concentrations of natural radionuclides were higher than those reported in the same studies in other countries. Also, the annul effective dose for the three age groups was much higher than the recommended value (0.1 mSvyr-1), as reported by the WHO. The excess lifetime cancer risk for three radionuclides, 226Ra, 228Ra, and 40K, were less than the acceptable value of 10-3 for radiological risk, while the risk for 210Pb was higher than the recommended value. Conclusion: According to the results of this study, the frequent use of bottled waters produced in different provinces of Iran possess health hazards to consumers.

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